Journal Impact Factor (Journal Citation Reports, by Clarivate Analytics)
If a journal title is not found in Journal Citation Reports, see if it is included in the Web of Science Master List. If not, the journal is unlikely to have a Journal Impact Factor since JCR includes only titles from the Master List.
CiteScore (by Elsevier)
Eigenfactor Scores through 2015 are freely provided on its web page. Current Eigenfactor Scores can be found either through Journal Citation Reports or by visiting a journal's web page.
CWTS Journal Indicators (by Leiden University)
Journal Web Sites
Journal-level metrics can often be found on a journal's website if it was given one. See its "About" section, or "Journal Home," "Overview," or similar areas of the journal web site. See the example and links below.
A journal's web site should also provide contact information for their editors and editorial board who may be able to advise.
What if I can't find the Journal Impact Factor or other bibliometric for a journal?
When this happens, it is not necessarily a mark of a poor quality or low impact publication Here are some reasons a journal may not have one:
It depends. Various disciplines measure their publications differently from one another, and also have differences in their publishing norms. One shortcoming of bibliometrics is some types are not normalized for field differences.
Here is a comparison of a library and information science journal when compared to a medical journal. Keep in mind that medicine has a longer publishing history and relies heavily on published articles in comparison to library science, which account for the big differences in JIF.
Highest Ranking Journals:
Field: Library & Information Science
International Journal of Information Management
Established 1980. 5.063 (JIF), 4,885 total cites.
Field: Medicine, General & Internal
New England Journal of Medicine
Established 1828. 70.870 (JIF), 344,591 total cites.
Also, the length of time a publication has been in existence and the number of its articles cited influence its bibliometric indicators; publications that are long-established tend to be favored. In summary, a standardized ranking or scale that identifies "high impact" for all disciplines does not exist.
How can I determine impact factor or metric ranges?
1. Keep in mind that not all scholarly journals are included in indexes like Scopus or Web of Science; those that are not included typically do not have journal metrics.
2. Use tools such as Scopus Preview (CiteScore) and others like it to identify metrics.
3. Comparisons. Comparing journals with others in a field or discipline is not an exact science; disciplines often overlap in what they study, and their boundaries can be unclear. However, comparisons can be done for exploratory purposes. For this example, a geoscientist can get an idea of CiteScore ranges for journals in his or her field (with 31.07 being the highest to 3.71 being the lowest in 2018), and possibly mention this range in a review or for a P&T bid.